Every tool here is built on standard pool-industry math, shown openly so you can check our work. Results are estimates for planning and education — always confirm with a test kit before adding chemicals.
Volume is the area of the water surface times the average water depth, converted to gallons at 7.48 U.S. gallons per cubic foot. Rectangles use length × width; round pools use π × radius²; ovals use π × (length/2) × (width/2); kidney pools use the industry estimate 0.45 × (A + B) × length. Sloped pools are modeled section-by-section (shallow flat + slope + deep flat) for a more accurate result than a single average depth.
Almost every chemical dose — chlorine, acid, cyanuric acid, salt — is a rate per volume of water. Get the gallons wrong and every dose after it is wrong too. That's why the pool volume calculator is the foundation the other tools build on.
Real pools have steps, benches, and irregular floors that a formula can't see, so treat results as close estimates rather than exact figures. For chemistry, your test kit is the source of truth — these tools tell you roughly how much to add, not whether you've added it correctly.